Select Optimize for: in the Paper tab of your printer driver, and choose the media that you are
Optimizing print quality for media types
for instructions. This feature is also
available in HP LaserJet Device Configuration. See the product software Help for details.
Clean the inside of the printer. See
Cleaning and maintenance
Check the media type and quality. See
Product media specifications
for more information.
Try installing a new HP print cartridge. See
HP LaserJet print cartridges
Plug the printer directly into an AC outlet instead of into a power strip.